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<p>[QUOTE=&quot;satootoko, post: 45848, member: 669&quot;]Agreed!With ancients you are normally faced with centuries of repose in the ground, and all of the attendant corrosion and damage, along with encrusted dirt.&nbsp; Olive oil is acidic - very weak, but acidic nonethelss.&nbsp; That&#039;s why it works so slowly, and why because it <i>is</i> affecting the surface so slowly, it is reasonably simple to stop the process before the original coin metal is seriously affected.</p><p><br /></p><p>Pure acetone - from the hardware or paint store, most emphatically <b>not</b> from the cosmetic counter - is Ph neutral, neither acidic nor alkaline, and lacking free oxygen radicals, doesn&#039;t directly affect metal one way or another, which is why it has widespread (not unanimous) support for use on coins.&nbsp; It <i>will</i> attack PVC slime, and organic substances including many glues and tape residues, but it can also interact with the chemical compounds known as tarnish (aka &quot;toning&quot;), which is the reason usually given by its detractors for avoiding its use.[/QUOTE]</p><p><br /></p>

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